Currently users commonly used series of intelligent dual power automatic transfer switch has the following categories. 1. intelligent dual power automatic switch (PC level) intelligent dual power automatic switch from the switch body and the power to change the two most controllers. Electromagnetic drive, switching controller working power, AC main and standby power 220V power supply, no additional control power. 2. Automatic transfer switch automatically switch from an integral molded case switch disconnectors, an actuator and a controller. For high-rise buildings, telecommunications, industrial and mining, shipping and other important places require uninterrupted power supply line user facilities, electrical equipment of double-loop power supply system conversion and isolation. By automatic or manual operation, complete the conversion common power supply and standby power supply. A sharp increase in electricity consumption in urban inevitable trend, to better meet the higher demand for electricity reliability. 3.CB-level dual power automatic switch-selective circuit breaker or fuse protection policy means that CB-level dual power automatic switching device protection appliances, and dual power feed distribution unit automatically switches the electrical circuit protection circuit breaker is or fuses dual power, there are problems with selectivity between the protection of electrical protection. Because dual power automatic switching device service object is a load, a load of important load and secondary load, so CB-level dual power automatic switching device to be taken seriously with the problem of selective protection. Breaker CB-level dual power automatic switching device and on demand, the lower the protection of electrical protective selectivity. When the CB-level dual power automatic switching device for protection of electrical fuses, if the protection of electrical feeder lines also fuses, and installed in the same cabinets, upper and lower secondary fuse connected in series between the fuse if the rated current a difference of more than 1.6 times or 1.6 times the rated within reach until the breaking capacity of the entire range of overcurrent protection can basically achieve absolute selectivity. Dual power automatic switching on the device to protect the lower selectivity of protective devices should be checked. Dual power automatic transfer switch ATSE ATSC development process that dual power automatic transfer switch, a switch from appliances and other electrical components required, as the end of the fire load and other important load of each switch device, ATSE important load in the power supply system is an indispensable and important part. ATSE present in our country has gone through four stages of development, namely two contact-type, two breaker type, field type dedicated electric switch and special switch. Two contact-type switch for the first generation, is China's first production of dual power switch, which is composed of two overlapping contacts made simple power supply, this device is not reliable due to mechanical interlocking, large power consumption, etc. disadvantage, thus using less and less in the project. Two circuit breaker type switch for the second generation, which is the CB-ATSE our national standards and IEC standards mentioned, it is the transformation made by two circuit breakers, comes with dual-stage mechanical interlock PC power supply, a short-circuit or overcurrent protection features dual power supply manufacturer, but a mechanical interlock unreliable. Excitation type-specific conversion switch to the third generation, an integral unit which is excited by external controllers constitute contactors, mechanical interlock and reliable conversion attractive to be driven by a solenoid switch, fast. Electric dedicated switch for the fourth generation, is a PC-class ATSE, its subject is consistent with the isolation switch, integrated mechanical and electrical switching equipment, conversion driven by a motor, a smooth transition and fast, and has had 0 features. ATSE dual power switch on the market is currently divided into three series CB-level dual power, ATSE in the market is mainly divided into three series, excitation, double breaker type, mechatronic smart. Which mechatronic smart (PC level) only domestic Shanghai Thai Industries Limited production ZTQ products, foreign production of Schneider products. Every owner can choose the right product according to their actual situation. But prospects of PC-ATSE is unlimited. PC-class dual power supplies, dual power, just stop by the Shanghai Industrial and Thailand Thai Industrial Co., Ltd. Yueqing Branch provided. Shanghai only Thai Industrial Co., Ltd. Yueqing Branch (www.cnats.cc) strong, credible, in Wenzhou, Zhejiang switch industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead only Thai Industries and you hand into the brilliant, for a better future!